How did the Supreme Court decision to throw out laws about children at work helping big businesses, which grew under another Supreme Court decisions?

Although the Keating-Owen Act was passed by Congress and signed into law by President Woodrow Wilson, the Supreme Court ruled that it was unconstitutional in Hammer v. Dagenhart 247 U.S. 251 (1918) because it overstepped the purpose of the government's powers to regulate interstate commerce.

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when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.